/* eslint-disable */
;(function(window) {
  //兼容
  window.URL = window.URL || window.webkitURL
  navigator.getUserMedia =
    navigator.getUserMedia ||
    navigator.webkitGetUserMedia ||
    navigator.mozGetUserMedia ||
    navigator.msGetUserMedia

  var HZRecorder = function(stream, config) {
    config = config || {}
    config.sampleBits = config.sampleBits || 8 //采样数位 8, 16
    config.sampleRate = config.sampleRate || 44100 / 6 //采样率(1/6 44100)

    var context = new (window.webkitAudioContext || window.AudioContext)()
    var audioInput = context.createMediaStreamSource(stream)
    var createScript =
      context.createScriptProcessor || context.createJavaScriptNode
    var recorder = createScript.apply(context, [4096, 1, 1])

    var audioData = {
      size: 0, //录音文件长度
      buffer: [], //录音缓存
      inputSampleRate: context.sampleRate, //输入采样率
      inputSampleBits: 16, //输入采样数位 8, 16
      outputSampleRate: config.sampleRate, //输出采样率
      oututSampleBits: config.sampleBits, //输出采样数位 8, 16
      input: function(data) {
        this.buffer.push(new Float32Array(data))
        this.size += data.length
      },
      compress: function() {
        //合并压缩
        //合并
        var data = new Float32Array(this.size)
        var offset = 0
        for (var i = 0; i < this.buffer.length; i++) {
          data.set(this.buffer[i], offset)
          offset += this.buffer[i].length
        }
        //压缩
        var compression = parseInt(this.inputSampleRate / this.outputSampleRate)
        var length = data.length / compression
        var result = new Float32Array(length)
        var index = 0,
          j = 0
        while (index < length) {
          result[index] = data[j]
          j += compression
          index++
        }
        return result
      },
      encodeWAV: function() {
        var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate)
        var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits)
        var bytes = this.compress()
        var dataLength = bytes.length * (sampleBits / 8)
        var buffer = new ArrayBuffer(44 + dataLength)
        var data = new DataView(buffer)

        var channelCount = 1 //单声道
        var offset = 0

        var writeString = function(str) {
          for (var i = 0; i < str.length; i++) {
            data.setUint8(offset + i, str.charCodeAt(i))
          }
        }

        // 资源交换文件标识符
        writeString("RIFF")
        offset += 4
        // 下个地址开始到文件尾总字节数,即文件大小-8
        data.setUint32(offset, 36 + dataLength, true)
        offset += 4
        // WAV文件标志
        writeString("WAVE")
        offset += 4
        // 波形格式标志
        writeString("fmt ")
        offset += 4
        // 过滤字节,一般为 0x10 = 16
        data.setUint32(offset, 16, true)
        offset += 4
        // 格式类别 (PCM形式采样数据)
        data.setUint16(offset, 1, true)
        offset += 2
        // 通道数
        data.setUint16(offset, channelCount, true)
        offset += 2
        // 采样率,每秒样本数,表示每个通道的播放速度
        data.setUint32(offset, sampleRate, true)
        offset += 4
        // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8
        data.setUint32(
          offset,
          channelCount * sampleRate * (sampleBits / 8),
          true
        )
        offset += 4
        // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8
        data.setUint16(offset, channelCount * (sampleBits / 8), true)
        offset += 2
        // 每样本数据位数
        data.setUint16(offset, sampleBits, true)
        offset += 2
        // 数据标识符
        writeString("data")
        offset += 4
        // 采样数据总数,即数据总大小-44
        data.setUint32(offset, dataLength, true)
        offset += 4
        // 写入采样数据
        if (sampleBits === 8) {
          for (var i = 0; i < bytes.length; i++, offset++) {
            var s = Math.max(-1, Math.min(1, bytes[i]))
            var val = s < 0 ? s * 0x8000 : s * 0x7fff
            val = parseInt(255 / (65535 / (val + 32768)))
            data.setInt8(offset, val, true)
          }
        } else {
          for (var i = 0; i < bytes.length; i++, offset += 2) {
            var s = Math.max(-1, Math.min(1, bytes[i]))
            data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7fff, true)
          }
        }

        return new Blob([data], { type: "audio/wav" })
      }
    }

    //开始录音
    this.start = function() {
      audioInput.connect(recorder)
      recorder.connect(context.destination)
    }

    //停止
    this.stop = function() {
      recorder.disconnect()
    }

    //获取音频文件
    this.getBlob = function() {
      this.stop()
      return audioData.encodeWAV()
    }

    //回放
    this.play = function(audio) {
      audio.src = window.URL.createObjectURL(this.getBlob())
    }

    // 上传
    this.upload = function(url, callback) {
      var fd = new FormData()
      fd.append("audioData", this.getBlob())
      var xhr = new XMLHttpRequest()
      if (callback) {
        xhr.upload.addEventListener(
          "progress",
          function(e) {
            callback("uploading", e)
          },
          false
        )
        xhr.addEventListener(
          "load",
          function(e) {
            callback("ok", e)
          },
          false
        )
        xhr.addEventListener(
          "error",
          function(e) {
            callback("error", e)
          },
          false
        )
        xhr.addEventListener(
          "abort",
          function(e) {
            callback("cancel", e)
          },
          false
        )
      }
      xhr.open("POST", url)
      xhr.send(fd)
    }

    //音频采集
    recorder.onaudioprocess = function(e) {
      audioData.input(e.inputBuffer.getChannelData(0))
      //record(e.inputBuffer.getChannelData(0));
    }
  }
  //抛出异常
  HZRecorder.throwError = function(message) {
    alert(message)
    throw new function() {
      this.toString = function() {
        return message
      }
    }()
  }
  //是否支持录音
  HZRecorder.canRecording = navigator.getUserMedia != null
  //获取录音机
  HZRecorder.get = function(callback, config) {
    if (callback) {
      if (navigator.getUserMedia) {
        navigator.getUserMedia(
          { audio: true }, //只启用音频
          function(stream) {
            var rec = new HZRecorder(stream, config)
            callback(rec)
          },
          function(error) {
            switch (error.code || error.name) {
              case "PERMISSION_DENIED":
              case "PermissionDeniedError":
                HZRecorder.throwError("用户拒绝提供信息。")
                break
              case "NOT_SUPPORTED_ERROR":
              case "NotSupportedError":
                HZRecorder.throwError("浏览器不支持硬件设备。")
                break
              case "MANDATORY_UNSATISFIED_ERROR":
              case "MandatoryUnsatisfiedError":
                HZRecorder.throwError("无法发现指定的硬件设备。")
                break
              default:
                HZRecorder.throwError(
                  "无法打开麦克风。异常信息:" + (error.code || error.name)
                )
                break
            }
          }
        )
      } else {
        HZRecorder.throwErr("当前浏览器不支持录音功能。")
        return
      }
    }
  }

  window.HZRecorder = HZRecorder
})(window)
